Agreed that checks and balances are good, but the US constitution was written without large, permanent political parties in mind. Take the power of impeachment

Agreed that checks and balances are good, but the US constitution was written without large, permanent political parties in mind. Take the power of impeachment, the ultimate Congressional trump card against executive overreach. Why has no one seriously advocated its use during the last two administrations? Because history has shown that in practice it isn't a weapon for use by Congress against an overweening president, but rather by one political party against the other.